The energy of ionizing radiation is measured in electronvolts (eV). One electronvolt is an extremely small amount of energy. Commonly used multiple units are kiloelectron (keV) and megaelectronvolt (MeV).
6,200 billion MeV = 1 joule
1 joule per second = 1 watt
1 keV = 1000 eV, 1 MeV = 1000 keV
Watt is a unit of power, which is the equivalent of energy (or work) per unit time (e.g., minute, hour).
